Back hatch will not lock on 2006 Chevrolet Tahoe

Just purchased a 2006 tahoe and the back hatch does not want to lock. What to do and how to fix this problem.

Asked by for the 2006 Chevrolet Tahoe
The latch assembly has probably failed, Stop by your local body shop and have them order a latch and replace it
1 more answer
I had the same problem with mine. I found one on ebay for about half price of a new one and all works well now.